About SunriseSunset
SunriseSunset is a free astronomical data service providing precise sunrise, sunset, golden hour, blue hour, twilight, and moon phase times for thousands of cities worldwide.
How We Calculate Sunrise Times
All times on this site are computed using the SunCalc library by Vladimir Agafonkin, which implements the algorithms from Astronomical Algorithms by Jean Meeus. Our calculations account for atmospheric refraction at standard conditions (1013.25 hPa, 10°C) and use IANA timezone database entries for all 6,000+ cities.
Accuracy: Within ±1 minute for latitudes below 70°. At extreme latitudes above 70°, atmospheric refraction variability may add ±2–3 minutes of uncertainty.
Times are displayed in local timezone for each city, using IANA timezone data to handle daylight saving time transitions automatically.
Who We Serve
- Photographers: Plan golden hour and blue hour sessions precisely
- Travelers: Know sunrise/sunset times before you arrive
- Outdoor enthusiasts: Hikers, runners, cyclists planning daylight activities
- Sailors & pilots: Twilight calculations for navigation planning
- Gardeners: Track seasonal daylight changes
Coverage
We cover 6,000+ cities across 195 countries, with data available in 6 languages: English, German, Portuguese, Japanese, French, and Spanish. Monthly sunrise/sunset tables are available for all cities, making it easy to plan ahead.
Data Freshness
Times are computed daily and cached for up to 24 hours. All displayed data reflects today's astronomical conditions for the selected city.
Data Sources
Astronomical calculations use the SunCalc open-source library. City coordinates and timezone data are sourced from GeoNames. For reference, our methodology aligns with USNO (US Naval Observatory) published times.
Contact
Questions or feedback? Visit our contact page.